Determination of the Dalitz plot parameter alpha for the decay eta->3pi⁰ with the Crystal Ball at MAMI-B

M. Unverzagt , P. Aguar-Bartolome , J. Ahrens , J.R.M. Annand , H.J. Arends , R. Beck , V. Bekrenev , B. Boillat

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A. Braghieri D. Branford W.J. Briscoe J.W. Brudvik S. Cherepnya R. Codling E.J. Downie L.V. Filkov D.I. Glazier R. Gregor E. Heid D. Hornidge O. Jahn V.L. Kashevarov R. Kondratiev M. Korolija M. Kotulla D. Krambrich B. Krusche M. Lang V. Lisin K. Livingston S. Lugert I.J.D. MacGregor D.M. Manley M. Martinez-Fabregate J.C. McGeorge D. Mekterovic V. Metag B.M.K. Nefkens A. Nikolaev R. Novotny R.O. Owens P. Pedroni A. Polonski S.N. Prakhov J.W. Price G. Rosner M. Rost T. Rostomyan S. Schumann D. Sober A. Starostin I. Supek C.M. Tarbert A. Thomas Th. Walcher D.P. Watts F. Zehr

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classification ✦ hep-ex

keywords alphaeta-ballcrystaldalitzdecaymami-bparameter

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A precise measurement of the Dalitz plot parameter, alpha, for the eta->3pi^0 decay is presented. The experiment was performed with the Crystal Ball and TAPS large acceptance photon detectors at the tagged photon beam facility of the MAMI-B electron accelerator in Mainz. High statistics of 1.8*10^6 eta->3pi^0 events were obtained, giving the result alpha = -0.032 +/- 0.002(stat) +/- 0.002(syst).

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Determination of the Dalitz plot parameter alpha for the decay eta->3pi⁰ with the Crystal Ball at MAMI-B

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